Octane Corrector
1 – nut; 2 – body; 3 – octane corrector
When operating a car, sometimes, depending on the quality of the fuel being filled, it becomes necessary to adjust the ignition timing. The ignition timing is adjusted by an octane corrector, which allows the ignition timing to be reduced or increased. Signs "+" (advance) and "-" (lag), applied to the octane corrector scale indicate the direction of its rotation.
Adjust the ignition timing on a warm engine. Before adjusting, mark the position of the middle line of the octane corrector on the cylinder block. When driving on a level road in direct gear at a speed of 50 km/h, sharply press the accelerator pedal. If this causes minor and short-term detonation, then the ignition timing is set correctly.
In case of strong detonation (early ignition) loosen nut 1 and turn housing 2 0.5–1 division clockwise (to "-"). If there is no detonation (late ignition) turn body 2 0.5–1 division counterclockwise (to "+").
After adjustment, tighten nut 1 and check again for correct ignition timing while driving.